<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>

  <script src="https://cdn.bootcdn.net/ajax/libs/vue/2.7.14/vue.min.js"></script>
  <div class="app">
    <ul>
      <li v-for="item in arr">{{item.id}}<button @click="del(item.id)">删除</button></li>
    </ul>
    <button @click="add">生成</button>
  </div>
  <script>
    const app = new Vue({
      el: '.app',
      data: {
        arr: [{
          id: 1,
          msg:'11'
        },
        {
          id: 5,
        }]
      },
      methods: {
        add() {
          this.arr.push({id:parseInt(Math.random(0)*21)})
        },
        del(e){
      console.log(e);
        }
      }
    })
  </script>
</body>

</html>